The show took place on the couple's 10th wedding anniversary. Kidman, 49, is currently in Australia, where both stars grew up, filming season two of the show "Top of the Lake." During his concert, Urban said he planned to fly there after the gig to see her.

"We booked the tour at the beginning of the year and June 25th was going to happen in Boston," he said. "And so, I said to Nic, 'I can't work on our anniversary and so maybe we'll play Boston another time.' And she said, 'What about I come up to Boston instead?' I said, 'That's a great plan.'"

"She was scheduled to shoot a film in Australia and it was going to happen last month," he continued. "So everything was winding up, it was looking really good and suddenly they said, 'We're actually gonna shoot the film in June in Australia,' which threw everything out. So after the gig tonight I am flying to Australia to celebrate our anniversary."

During his concert, Urban had photos of his family displayed for the audience. Among them was a pic from his and Kidman's first-ever meeting, at the 2005 "G'Day L.A.: Australia Week" gala. Urban had shared the photo on his Instagram page hours earlier.